Anthropic Releases Claude Opus 5.5, Matching Fable-Level Performance at 40% Lower Cost
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Anthropic released Claude Opus 5.5 on September 22, 2026, delivering Fable 5.1-tier performance at 40% lower cost than its flagship Opus 5 model. The new model represents the first in a new 5.5 family, arriving two months after Opus 5's July release.
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